处理PL / SQL错误：捕获异常而不抛出异常

Question

我有一个抛出此异常的程序

error_stack -> ORA-00030: El identificador de sesión del usuario no existe.
 error_backtrace -> ORA-06512: en "OF_OWNER.GET_INVOICES", línea 46
 call_stack -> ----- PL/SQL Call Stack -----
  object      line  object
  handle    number  name
00000010DB020548        59  procedure OF_OWNER.GET_INVOICES
000000112A537E58         2  anonymous block

但我不希望程序在这种情况下引发任何异常，我已经尝试了

 ...
 WHEN  'ORA-00030' THEN
 WHEN OTHERS
 ...

但是我收到了编译错误

Answer 1

或者：

BEGIN
  do something
EXCEPTION WHEN OTHERS THEN
  IF SQLCODE = -30 THEN
    NULL; -- ignore this particular exception
  ELSE
    RAISE; -- but throw the others
  END IF;
END; 

或者：

DECLARE
  ORA00030 EXCEPTION; -- or any other name you like instead of ORA00030
  pragma EXCEPTION_INIT(ORA00030, -30); -- link your exception name to the code
BEGIN
  do something
EXCEPTION WHEN ORA00030 THEN
  NULL; -- ignore this particular exception
END;